refactor: make _griffe_compat a submodule that generates import stubs

[machow]

This PR removes the use of the internal _griffe module (#387). It's a little bit funky, but as a way of maintaining a tighter scope on imports--compared to using the full top-level griffe module--I just generated submodules importing the subsets of griffe I was using before.

It's not pretty, but it's helpful for giving me a quick hint on how quartodoc modules separate concerns (or dispatch on certain pieces, e.g. by looking for the dc. prefix)

Main pieces:

• running python -m quartodoc._griffe_compat._generate_stubs creates the 3 submodules (e.g. dataclasses.py)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.80%. Comparing base (ee4fa3c) to head (1d5077e).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #393      +/-   ##
==========================================
+ Coverage   88.78%   88.80%   +0.02%     
==========================================
  Files          37       40       +3     
  Lines        3004     3010       +6     
==========================================
+ Hits         2667     2673       +6     
  Misses        337      337              

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